/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * netutils/netlib/netlib_parsehttpurl.c
 *
 *   Copyright (C) 2009, 2011 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/

/****************************************************************************
 * Included Files
 *****************************************************************************/

#include <tinyara/config.h>

#include <stdint.h>
#include <string.h>
#include <errno.h>

#include <apps/netutils/netlib.h>

/****************************************************************************
 * Private Data
 *****************************************************************************/

const char g_http[] = "http://";
const char g_https[] = "https://";
#define HTTPLEN 7
#define HTTPSLEN 8

/****************************************************************************
 * Public Functions
 *****************************************************************************/

/****************************************************************************
 * Name: netlib_parsehttpurl
 ****************************************************************************/

int netlib_parsehttpurl(const char *url, uint16_t *port, char *hostname, int hostlen, char *filename, int namelen)
{
	const char *src = url;
	char *dest;
	int bytesleft;
	int ret = OK;
	int https = 0;

	/* A valid HTTP URL must begin with http:// if it does not, we will assume
	 * that it is a file name only, but still return an error.  wget() depends
	 * on this strange behavior.
	 */
	if (strncmp(src, g_https, HTTPSLEN) == 0) {
		https = 1;
		*port = 443;
	} else if (strncmp(src, g_http, HTTPLEN) == 0) {
		*port = 80;
	} else {
		return -EINVAL;
	}

	/* Skip over the http:// */
	if (https) {
		src += HTTPSLEN;
	} else {
		src += HTTPLEN;
	}

	/* Concatenate the hostname following http:// and up to the termnator */
	dest = hostname;
	bytesleft = hostlen;
	while (*src != '\0' && *src != '/' && *src != ' ' && *src != ':') {
		/* Make sure that there is space for another character in the hostname.
		 * (reserving space for the null terminator)
		 */

		if (bytesleft > 1) {
			*dest++ = *src++;
			bytesleft--;
		} else {
			ret = -E2BIG;
		}
	}
	*dest = '\0';

	/* Check if the hostname is following by a port number */

	if (*src == ':') {
		uint16_t accum = 0;
		src++;					/* Skip over the colon */

		while (*src >= '0' && *src <= '9') {
			accum = 10 * accum + *src - '0';
			src++;
		}
		*port = accum;
	}

	/* The rest of the line is the file name */

	if (*src == '\0' || *src == ' ') {
		ret = -ENOENT;
	}

	/* Make sure the file name starts with exactly one '/' */

	dest = filename;
	bytesleft = namelen;
	while (*src == '/') {
		src++;
	}
	*dest++ = '/';
	bytesleft--;

	/* The copy the rest of the file name to the user buffer */

	strncpy(dest, src, namelen);
	filename[namelen - 1] = '\0';
	return ret;
}
